Drill-jar.



A. S. CALHOUN.

DRILL JAR.

APPLICATION FILED OCT. 13. 19M.

Patented Sept. 21, 1915.

vation of the improved device.

AENT OFFICE.

ANDREW S. CALHOUN, OF EAST LIVERPOOL, OHIO.

DRILLLJAR.

Application filed. October 13, 1914. Serial No. 866,451.

To all whom it may concern.

Be'it known that I, ANDREW S. CALHOUN, citizen of the United States, residing at East Liverpool, in the county of Columbiana and State of Ohio, have invented certain new and useful Improvements in Drill- Jars, of which the following is a specification.

This invention relates to improvements in drill jars employed in drilling oil wells, Artesian wells, and for like purposes, and has for one of its objects to improve the construction and increase the efliciency and utility of devices of this character.

Another object of the invention is to provide a simply constructed device wherein provision is made for preventing undue resistance when operating in wells containing Water or other liquid.

Another object of the invention is to provide a'simply constructed device of this character in which provision is made for facilitating the removal of the body of the device in event of the fracture of the plunger or mandrel.

Another object of the invention is to provide a simply constructed device which may be employed with a drill or with a reamer without structural change therein.

Another object of the invention is to provide a device having a mandrel or plunger so constructed that it will move through the water within a well with a comparatively slight resistance.

With these and other objects in view the invention consists in certain novel features of construction as hereinafter shown and described and then specifically pointed out in the claims; and in the drawings illustrative of the preferred embodiment of the invention Figure 1 is a vertical sectional ele- Fig. .2 isa side elevation of the same viewed at right angles. to the structure shown in Fig. 1. Fig. 3 is a transverse section on the line 3-3 of Fig. 2.

Corresponding and like parts are referred to in the following description and indicated in all the views of the accompanying drawings by the same reference characters.

The improved device comprises a tubular shell-or body 10 having a socket 11 integral therewith at one end to receive a drill,

reamer, or other tool and formed with an intermediate angular portion 12 to receive a wrench. At its upper end the shell 10 is provided with an annular collar 14 integral w1th the upper end of the shell and forming a guideway for the mandrel or plunger 15. At its upper end the mandrel'or plunger-15 is provided with the usual head 16 having a tapered threaded terminal 17 of the usual form to receive the shackle or coupling for the operating rope or cable. The head 16 is provided with the usual angular portion 18 to receive an operating wrench, to hold the head while the cable is being coupled thereto. The mandrel 15 is oval or elliptical in transverse section as illustrated in Fig. 3, and the aperture through the collar 14 corresponds in shape thereto so that the mandrel while free to be moved vertically relative to the shell and the collar, will not rotate therein.

At its lower end the mandrel 15 is provided .with a tip 19, preferably integral therewith, and arrow shaped, as shown, with the point downwardly to facilitate the passage of the tip through the water within the shell when the device is operated in a well containing water or other liquid. The shell 10 is provided with a plurality of transverse relatively short slots 20, the slots being separated by sections of the body of the shell, so that the presence of the slots does not weaken the shell, while at the same time permitting free circulation of the water or other liquid transversely through the shell and around-the mandrel. By this arrangement when the mandrel is actuated, .or moved. vertically through the shell, any water contained therein will be thrown outwardly through the slots and thus prevent the resistanceof the water from effecting the free operation of the device.

In constructing the device the shell 10 is formed bell shaped or flaring with the colhr 14 roughly outlined. When the parts are to be assembled, the flaring end of the shell is heated to a forging heat and after the mandrel 15 and its tip have been inserted, the flaring terminal'of the shell is placed under the hammer and the flaring portion reduced to the form shown in Figs. 1 and 2.v

The mandrel 15 together with its tip 19 is considerably shorter than the distance be tween the collar 11 and the upper end 13 of the socket member 11, so that in event of the breakage of the mandrel, the latter will drop into the interior of the shell and thus be prevented from blocking or choking the' aperture through the collar 14. In devices oi? this character the juncture of the head 16 and the mandrel 15 is generally the eakest point in the structure and breakage generally occurs at this point, and When that occurs, the shell 10 together With the socket 11 and the drill attached thereto, and the broken off portion of the mandrel, remain in the well and must be removed by a suitable grappling implement. The grappling implement usually employed is in the form of a spear which passes through the aper ture of the collar 14: and thus engages the collar from the lower side and enables the shell to be removed, but if the mandrel does not drop away from the aperture of the collar 14, the aperture will be choked and prevent the passage of the grappling implement. It will thus be seen that forming the mandre 15 relatively short so that it will drop away from the aperture of the collar 11% in event of breakage is an important feature o1 applicants device, and materially increases its ei'iiciency and utility.

It the device is to be employed for actuating a drill, the shell 10 and the socket 11 carrying the drill will operate vertically or with an up and down movement.

It the device is to be employed With a reamer, or to receive an under reamer implement, the head 16 Will be rotated instead of being moved vertically, thus applying a rotary motion to the shell and to the socket and its attachment, the oval form of the mandrel permitting this rotary motion to be applied, as will be obvious, While at the same time the oval form of the mandrel does not interfere \vith the vertical movement when the device is employed with a drill or for an up and down movement.

A suiiicient space is left between the mandrel and the stock to permit the necessary play to prevent cramping or the centering of the tool at the point Where the jars are connected thereto. By this means the tendency of the pins to break is obviated.

The improved device is simple in construction, can be manufactured at no increase of expense over the ordinary implement of this character, While at the same time possessing materially great advantages over the ordinary form of drill jars.

Having thus described the invention, What is claimed as new is In a device of the class described, a tubular stock'having a plurality of lateral vent slots and with a tool socket at one end anc a guide aperture at the other end, a mandrel operating through said guide aperture and having a lateral enlarged tip, said mandrel and its tip being of less length than the interior of the stock, whereby the guide aperture will be automatically cleared of obstructions in event of the breakage of the mandrel, and means for coupling an operative member to said mandrel.

In testimony whereof I my signature in presence of two Witnesses.

Tries. C. Dawson, JAMES E. DAVIS, 

